Light bosons, beyond the standard model and as prominent candidates for dark matter, can mediate velocity and spin dependent exotic interaction between electron spins and nucleons. At short ranges, it remains an open challenge to test this exotic interaction with high precision. Here, we present a method based on diamagnetic-levitated force sensor to detect the exotic interaction at the millimeter scale. Improved constraints for the coupling gAegVN are established, within the force range spanning from 0.15 mm to 1.5 mm. And the constraint ∣gAegVN∣≤4.39×10−26 at λ = 0.5 mm at the 95% confidence level, significantly surpasses previous results by more than three orders of magnitude. The diamagnetic levitation force measurement system developed here can also be repurposed to probe other exotic spin-dependent interactions, such as the exotic spin-spin interaction. This system provides a platform for the exploration of dark matter.
@article{arxiv.2503.20270,
title = {Constraints on Velocity and Spin Dependent Exotic Interaction at the Millimeter Scale with a Diamagnetic-levitated Force Sensor},
author = {Kenan Tian and Yuanji Sheng and Rui Li and Lei Wang and Peiran Yin and Shaochun Lin and Dingjiang Long and Chang-Kui Duan and Xi Kong and Pu Huang and Jiangfeng Du},
journal= {arXiv preprint arXiv:2503.20270},
year = {2025}
}